Bran-duster



(No Model.)

2 sheetssheet 41.

C. M. GILBERT.

BEAN DUSTER.

Patented Nov. 22, 1887.

(No Model.) 2 Sheets-Sheet 2.

C. M. GILBERT.

BEAN DUSTER.

Patented Nov. 22', 1887. 2PZ/gv N. PETERS, Pham-Lilhngmphan wnmingmn,tu;

UNITED STATES PATENT rEicE.

CHARLES M. GILBERT, OF MINNEAPOLIS, MINNESOTA.

BRAN-DUSTER.

SPBCIFICATIGN forming part of Letters Patent No. 373,453, dated November22, 1887.

(No model.)

To all whom it may concern.-

Be it known that I, CHARLES M. GILBERT, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ot'Minnesota, have invented certain new Vand useful Improvements inBran-Busters, of

which the following is a specification.

My invention relates, mainly, to improvenient of the devices for freeingbran-finster screens of adherent dust and iiour, as will be hereinaftermore fully set forth.

Myimprovements are illustrated in the accompanying drawings, in which-Figure 1 is a central sectional elevation of the machine containing theimprovements, the dusting-case being shown in the position of itshighest vertical movement. Fig. 2 is a detached View of the upperbridge-tree. Fig. 3 is a detail of the cam-bearing spider. Fig. 4 is acentral section of the saine on the line wx of Fig. 3. Fig. 5 is adetached view of the intermediate bridge tree, showing the channel inwhich the cams of the spider travel; and Fig. 6 is a sectional view of aportion of the same on the irregular line y y of Fig. 5. Fig. 7 is a topview ofa portion of the head ofthe machine-housing, the dusting-casehead, the circular rack, its pinion, and the ring and packing within therack. Fig. 8 is a transverse section of a portion of the same on4 theline w w of Fig. 7. Fig. 9 is a plan View of the lower head of thedusting-case, and of the ring and packing surrounding it. Fig. 10 is atransverse section of the same on the line z z of Fig. 9; and Fig. `11the same as Fig. 10, but showing the dusting-case head at the limit ofits downward reciprocation.

In the drawings, 1 represents the cylindrical case of the machine,supported by legs or other supports, 2. A central vertical shaft, 3, hasits lower bearing in astep, 4, in a lighter screw, 5, which is supportedby the lower bridge-tree, 6, and has its upper bearing in a bridge-tree,7, at the head of the machine. This upper bridge-tree is of arched form,with its ends made fast to the top of the machine, and has anoil-chamber, 8, at the center, surrounding the shaft 3. rlhedriving-pulley 9 is near the lower end of the shaft.

Between the arched bridge-tree 7 and the head 10 of the machine-case isa pinion 11, iixed on the shaft3, which turns the spur-wheel 12. The hub13 of the spur-wheel is fast t0 aspindle, 14, and has its bearing on thebox 15, secured to the top of the machine.

On the lower end of the spindle 14 is a pinion, 16, fast thereto, andwhich meshes with the circular rack 17, which is secured to thedisk-head 18 of the dusting-case 19. By these means the dusting-case isslowly revolved.

The bran is fed to the dusting-case through the opening 20 in thecylinder-head, and thence through the opening 21 in the head of thedusting-case, whence it falls upon the revolving disk 22, carried by theshaft 3, and is thrown outward by the action of the disk to thewire-cloth 23 ofthe dusting-case. Brushes 24, carried by the shaft 3,and which have a rapid motion, sweep the wire-cloth and force the Hourandfine particles through the meshes. The bran within the dusting-case,after being subjected to the brush action, falls between the arms of thespider, which constitutes the lower head, 25, and is spouted off throughan opening, 26, in the lower head, 27, of the cylinder. The freed iionr,falling outside the dusting-case, is discharged from the machine throughthe opening 28.

rlhe lower head, 25, of the dusting-case has a downwardly-projectingdouble hub, composed of a larger upper portion, 29, and a smaller lowerportion, 30, the latter forming the bearing for the dusting-case andturning in a socket, 31, provided on the intermediate bridge-tree, 32.This hub extends below the lower head, 27, of the central opening, 33. Aplate, 34, having a central opening within which the shaft 3 turnsloosely, rests upon the dusting-case bottom and prevents bran and dustfrom falling into the hollow of the hub.

On the cylinder bottom 27 is bolted or otherwise secured a wooden ring,35, directly beneath the end of the dusting-case, and the inner side ofthe ring is covered with sheep-skin (with its wool) or other suitablepacking, 45. The dustingcase head 25 has an angular circular flange, 36,consisting of an upright p0rtion and a horizontal portion extendingoutward from the upright portion. The hori zontal portion of the Hangeis bolted to the ICO screen-frame of the dusting-case, and the up rightportion revolves 'in contact with the packing 45. A ring, 37, is alsobolted or attached byscrews to the cylinder-head 10 above thedusting-case head 18, and has its outer side covered with sheep-skin orother suitable packing, 45, and the rack 17 revolves with its innersurface in Contact with the packing. These rings, with their packing,should be high enough to keep theilange 36 and rack 17 in constantcontact with the packing during the longitudinal movements of thedusting-case, and such contact, While permitting` free rotary andlongitudinal movement of the dustingcase, prevents the passage of air ineither direction at those points, and thus prevents the mixing ofparticles of bran andl tlour that have been separated by the action ofthe dustingcase.

To the upper portion, 29, of the hub is attached the spider 38, the armsof which have downwardly-projecting iianges 39, whose under surfaces areinclined lengthwise to form cams' for engaging oppositely-inclinedsurfaces provided on the bridge-tree 32. An annular channel, 40, isformed by the circular flanges 4L on the bridge-tree, and serves as away for the cams 39 of the spider. The channel 40 may be made tight andkept filled with oil. In the channelare the inclined raised surfaces orcams 42, which are engaged by the revolving cams 39, and cause thespider, and consequently the dusting-case, to be lifted. VAs thedusting-case rotates slowly, it is gradually raised while thecamsurfaces are in contact, and when the ends of' the cams are reachedthe moving cams drop to the bottom of the channel, and ajaris given thedustingcase by the fall, which frees the cloth of adhering particles.Tor avoid unnecessary noise and wear ofparts, a small cushion, 43, ofrubber or other elastic material, is placed beneath `the offset of thecams 42, and the bottom of the channel is made to slope to the top of'the cushion, as shown at 44, Fig. 6.

What I claim, and desire to secure by Letters Patent, is

1. In a bran-duster, the combination, with an upright rotatingdusting-case, of cams carried by the lower head thereof, a wayin whichsaid cams move, and fixed cams therein engaged by the moving cams,substantially as set forth.

2. The combination, with a dusting case constructed with a head having ahub, of a bridge-tree having a socket for said hub, a circular channelprovided on said bridge-tree, cams in said channel, a spider attached tosaid hub, and cams thereon arranged to travel in said channel and engagesaid fixed cams, substantially as set forth.

3. The combination, with the dusting-case constructed with a doublehub,29 and 30, and socket 3l, of the spider 38, bearing-cams 39, and thechannel 40, provided with cams 42, substantially as set forth.

4. The combination,with the lower head,25, of the dusting-case havingthe angular flange 36, of the stationary ring 35 on the bottom of thehousing and the packing 45 between said flange and ring, for the purposeset forth.

5. The combination, with the cylinder-head 10V and dusting case head 18,of the ring 37, secured to the former, the circular rack 17, secured tothe latter, and the packing 45 between said ring and rack, substantiallyas and for the purpose set forth.

6. In a branduster, in combination, ahous` ing and its upper and lowerheads, a dustingcase and its upper and lower heads, mechanisms forrotating and reciprocating the dust'- ing'case, rings extending inwardfrom the invner surfaces of the housing-heads, rings carried on thedusting case heads concentric with and overlapping said stationaryrings, and suitable packing in the annular spaces between the rings,forming therewith dust-tight joints adapted to permit rotary andlongitudinal movement of the dustingcase, and to prevent the mixing ofmaterial separated by the dusting-case, substantially as set forth.

CHARLES M. GILBERT. Vitnesses:

W. G. I-IoIT, P. H. GUNCKEL.

